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For seasonal users of hot tubs, some adjustment to your maintenance routines can be made, during times of non-use or very low use.
But that doesn't mean you can ignore the spa sanitation and filtration altogether! Leave a spa to it's own devices, without intervention, for too long and you'll have bacteria buildup, damaged filters or at least a very smelly hot tub.
If you tend to use the spa less during warmer weather (or less during colder weather), here's some tips on protecting your investment and avoiding costly clean-up of a spa gone too long without care.
It's tempting to leave the water in the hot tub or spa after the season, and drain it before using it again, but depending on how old the water is, and how long the tub will sit (all summer?), you may want to drain it now, as a step to 'summerizing' the spa. If your spa water is over 90 days old, and has been used semi-regularly, I would advise draining and refilling with water from a Pre-Filter. After refilling, balance the pH, alkalinity and calcium hardness, and shock the spa water with MPS.
A covered spa that is not heated will drop and stabilize to a temperature that is a bit lower than the outside air temperature. During freezing weather, it's important to keep the spa pump running, to avoid freeze damage. During hot summer weather, even with the heater off and spa covered, water temps can rise into the 80's. It's important to keep the spa pump running, to avoid algae and bacteria from growing during hot summer months.
Even though no one is using the spa, protect your shiny surfaces, cover, filter and rubber bits by checking the pH, alkalinity and calcium hardness levels on a monthly basis. After you balance the water, add a full dose of spa shock, to disinfect and oxidize the spa water, destroying any germs in the hot tub. Keep the hot tub cover open for about an hour after shocking, to allow the water to gas-off. If the water was cloudy during the monthly inspection, increase filter run time and/or sanitizer levels and consider using a clarifier to help the filter.
Because you aren't using the spa, you may not need to run a 3-5 ppm level of bromine, because the contaminants introduced to the water are very low. However, you will still need to keep some type of constant sanitizer in the water, to kill bacteria, viruses, algae. A spa Mineral Stick is a good idea to manage daily disinfection, with a monthly balancing and shocking of the spa. An ozonator can also accomplish the majority of the daily sanitation needs for the un-used hot tub, coupled with regular spa shocking. Bromine tubs can also just use fewer tablets in the floater or feeder, just 1 or 2 bromine tabs, to keep a low-range 1-2 ppm of bromine in the water. If you fill a spa floater with 9 tabs and close it the vents all the way, you should be able to deliver about 1ppm of bromine to the spa, constantly. Avoid allowing the spa water to filter only, without bromine, ozone, minerals or shock, it won't last long without some form of daily sanitation.
A tight fitting spa cover is important not only for spa safety, but also to keep out debris and sunlight. Be sure to clamp all of the cover clips around the spa cover. For protection from summer storms and high winds, use spa cover wind straps, and cover the spa cover with the Spa Cover Cap, to protect the cover from summer sun and rain, and also to make the spa more inaccessible or off-limits. If you want to be more explicit, post a Spa Closed sign, especially for rental properties or commercial spas that aren't of the single-family type.
Just as you need daily sanitation for the off-season spa, you also need daily circulation and filtration of the water. And just as you need less sanitation for an unused spa, you can get by with less filtration for a spa that is sanitized and un-used. Program your circulation pump to run on low speed for 3-6 hours daily, with a daily high speed run of about an hour. With summer weather comes greater possibility of power outages which can affect your pump timer programming or leave the spa in an OFF mode. Keep an eye and an ear towards the spa to be sure that the filter is running like it should.
BONUS TIP: Before putting the spa to bed, remove and clean the cartridge filter, or replace the spa filter if it's close to 24 months old.
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